diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
index 4eef56dd606..95db6f3f246 100644
--- a/js/src/jsapi.cpp
+++ b/js/src/jsapi.cpp
@@ -4841,36 +4841,6 @@ JS_ExecuteScript(JSContext *cx, JSObject *obj, JSScript *script, jsval *rval)
     return ok;
 }
 
-JS_PUBLIC_API(JSBool)
-JS_ExecuteScriptPart(JSContext *cx, JSObject *obj, JSScript *script,
-                     JSExecPart part, jsval *rval)
-{
-    JSScript tmp;
-    JSBool ok;
-
-    /* Make a temporary copy of the JSScript structure and farble it a bit. */
-    tmp = *script;
-    if (part == JSEXEC_PROLOG) {
-        tmp.length = tmp.main - tmp.code;
-    } else {
-        tmp.length -= tmp.main - tmp.code;
-        tmp.code = tmp.main;
-    }
-
-    /* Tell the debugger about our temporary copy of the script structure. */
-    const JSDebugHooks *hooks = cx->debugHooks;
-    if (hooks->newScriptHook) {
-        hooks->newScriptHook(cx, tmp.filename, tmp.lineno, &tmp, NULL,
-                             hooks->newScriptHookData);
-    }
-
-    /* Execute the farbled struct and tell the debugger to forget about it. */
-    ok = JS_ExecuteScript(cx, obj, &tmp, rval);
-    if (hooks->destroyScriptHook)
-        hooks->destroyScriptHook(cx, &tmp, hooks->destroyScriptHookData);
-    return ok;
-}
-
 /* Ancient uintN nbytes is part of API/ABI, so use size_t length local. */
 JS_PUBLIC_API(JSBool)
 JS_EvaluateScript(JSContext *cx, JSObject *obj,
diff --git a/js/src/jsapi.h b/js/src/jsapi.h
index 4d8f1c1c931..4704bedf22c 100644
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -2261,10 +2261,10 @@ extern JS_PUBLIC_API(JSString *)
 JS_DecompileFunctionBody(JSContext *cx, JSFunction *fun, uintN indent);
 
 /*
- * NB: JS_ExecuteScript, JS_ExecuteScriptPart, and the JS_Evaluate*Script*
- * quadruplets all use the obj parameter as the initial scope chain header,
- * the 'this' keyword value, and the variables object (ECMA parlance for where
- * 'var' and 'function' bind names) of the execution context for script.
+ * NB: JS_ExecuteScript and the JS_Evaluate*Script* quadruplets use the obj
+ * parameter as the initial scope chain header, the 'this' keyword value, and
+ * the variables object (ECMA parlance for where 'var' and 'function' bind
+ * names) of the execution context for script.
  *
  * Using obj as the variables object is problematic if obj's parent (which is
  * the scope chain link; see JS_SetParent and JS_NewObject) is not null: in
@@ -2304,10 +2304,6 @@ JS_ExecuteScript(JSContext *cx, JSObject *obj, JSScript *script, jsval *rval);
  */
 typedef enum JSExecPart { JSEXEC_PROLOG, JSEXEC_MAIN } JSExecPart;
 
-extern JS_PUBLIC_API(JSBool)
-JS_ExecuteScriptPart(JSContext *cx, JSObject *obj, JSScript *script,
-                     JSExecPart part, jsval *rval);
-
 extern JS_PUBLIC_API(JSBool)
 JS_EvaluateScript(JSContext *cx, JSObject *obj,
                   const char *bytes, uintN length,